On Monday attorneys for Aaron Rey Ybarra, 26, filed a notice of intent to pursue a not guilty by reason of insanity defense. The move doesn't mean they will go that route, just that they may use an insanity defense.

Seattle Mayor Ed Murray says he plans to call an emergency meeting of the Seattle City Council to discuss the “epidemic of gun violence” in the wake of two shootings that claimed three lives in the city in the past week.

“This city and this nation must address this sense of violence,” said the mayor at a Friday news conference with dozens of community leaders standing by his side. “We have to find a way to move forward.”

A Seattle Pacific University student managed to subdue a suspected gunman after four people were injured, one fatally, during a shooting on campus Thursday afternoon.

Police said a young man entered Otto Miller Hall with a shotgun and opened fire shortly before 3:30 p.m. The gunman was reloading when a student, who was working as the building monitor, confronted and subdued the gunman using pepper spray.

"Once on the ground, other students jumped on top of them, and they were able to pin the shooter to the ground until police arrived," said Seattle Police Capt. Chris Fowler.